One of my college professors has dedicated his career to proving that smiling makes you happy. He has reams of research to confirm this. So the easiest/quickest way to be happy is to smile. It is in fact impossible to be unhappy after a few minutes of smiling. The smiley face was also invented in my city.
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I used to do something called laughing yoga where we just smiled and laughed for an hour. And wow, it made me feel awesome! The following day my jaw muscles would ache from all the laughing ;)
No question about its effectiveness.
it releases all sorts of endorphins